Empty Effigy

Create a token that's a copy of target planeswalker you control, except it is not legendary. If any creatures are attacking that planeswalker, they attack the token copy instead. Exile that token at the beginning of the next end step.
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"Archie, our mind may be beyond either of our comprehensions, but one thing I can say with certainty is that our opponents' mind aren't."
--Estus